Narrative:

WX extremely poor in anchorage with continuous moderate snow, reduced visibility, deicing of aircraft. Flight delayed at gate over 2 hours. On takeoff aircraft was cleared to a heading 010 degrees at 3000 ft. At 3000 ft I set 100 degree heading. Approximately 10 seconds after rolling out on 100 degree heading, center called back the 010 degree again and the aircraft corrected back to the 010 degree heading. No other aircraft were in the area. No alerts on TCASII and no other comments from center were received. Aircraft proceeded normally. Fault was in the copilot (me) setting 100 degree heading when center called for a 010 degree heading. Captain and so did not catch the discrepancy due to the very high workload in the snowstorm. Possible solution is for center to state 010 degree or 10 degrees when giving headings and the 10 degrees and 100 degree headings.

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Original NASA ASRS Text

Title: B747-200 ASSIGNED A 010 DEG HDG, BUT FLEW 100 DEGS.

Narrative: WX EXTREMELY POOR IN ANCHORAGE WITH CONTINUOUS MODERATE SNOW, REDUCED VISIBILITY, DEICING OF ACFT. FLT DELAYED AT GATE OVER 2 HRS. ON TKOF ACFT WAS CLRED TO A HDG 010 DEGS AT 3000 FT. AT 3000 FT I SET 100 DEG HDG. APPROX 10 SECONDS AFTER ROLLING OUT ON 100 DEG HDG, CTR CALLED BACK THE 010 DEG AGAIN AND THE ACFT CORRECTED BACK TO THE 010 DEG HDG. NO OTHER ACFT WERE IN THE AREA. NO ALERTS ON TCASII AND NO OTHER COMMENTS FROM CTR WERE RECEIVED. ACFT PROCEEDED NORMALLY. FAULT WAS IN THE COPLT (ME) SETTING 100 DEG HDG WHEN CTR CALLED FOR A 010 DEG HDG. CAPT AND SO DID NOT CATCH THE DISCREPANCY DUE TO THE VERY HIGH WORKLOAD IN THE SNOWSTORM. POSSIBLE SOLUTION IS FOR CTR TO STATE 010 DEG OR 10 DEGS WHEN GIVING HDGS AND THE 10 DEGS AND 100 DEG HDGS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.